Dynamo electric machine



H. D. TAYLOR DYNAMO ELECTRIC MACHINE Filed May 20, 1929 Dec. 6, 1932.

H is Aotor-n eg Patented Dec. 6,1932

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inventionrelates lto dynamo electric machinesaa i I oftens describe'd as humming, singing, howlin'g or wh-istling,{ sometimes of steady; intensity,- 'bnt= u'sually pulsating "with a frequency,

a corresponding to the speed; of the machine. *The sourceofthe noise is'magnetic, and-this is shown by the factthat it stopsif the ma-' chinesaae driven-withthe windings thereofd it s. v

In many installations, suchas auditoriums,

" 'theaters,- or the'zlike, this noise is very ob j ectionable. 'Itis-there'foreathe object ofmy invention tor'educethe noise caused by such'machines d-uring operation and I accomplish, this by :arrangingslots gin; the 5 stationary or" mentary sectional 'views {of salient. pole dynamo electric machines, whichrarenoisy in operation, showing the center lines of 'the polesin alignment-with-the center-lines of the w teethof -the stationary members; Figs. 2', 6

i and 10; areWi'ews sir'nilarflto Fi s,- '1, 5 'and.9, showingthe" poles of the machines rotated one-half slot pitch from the pos-itions shown therein, so that the center: lines of P the poles anei'n alignment- "withthecenter lines of the,

slotsofthe stationary members; 3 and 4 show the inachine illustrated in Figs. -1, and 2 with ;the;;polesslotted. in accordance with my -'invention*'to reduce magnetic noise in the machine; F igs. ,f 7 and 8", show 'how magnetic noise in the machine shown in; Figs. 5 and 6! canibe substantially reduced by plugging ,the winding slot's :lin the face of the poles of'the machine and cutting other slots *therein, and

Figs. 11 and 1-2 indicate *how the noise pro ducedB- in- -.the- "machine shown 9 and 1 10 can :be ireduced' by-providing slats-m the pole-tacos:

"Dynamo-electric machines are frequently noisy in operation. The-mosttro1ib1esomeb-isou'rce ofi noise isa musical note, which =1si Referrmgtothe drawing,Ihaveshown my invention in connection; with-several :sahent 1929. Serial No. 364,376.

pole dynamo electric machines "which are f noisy in operation, and how slots can becut we inthe poles ofthe machines .to substantially i reducethis noise. In Figs. 1 to 12 each o'f the machines shown includesa slottedstation'ary memberor armature 10 having' s'uitable windmg coils 1,1 in the slots12 there'oflthe inding 'r coils being omitted in some of the slots of the stationary member for convenience in villustration.

In fFigs. 1 to 4 the salient pole 13 of the? machine is providedwith 'a winding having, "conductors 14 arranged in partially Jc'losed alignedwith the center line of the tooth 16 slots in the polefaceand conductors 15in the sides of the pole; In Fig. 1 the pole 13 is;

of the stationary member, and in Fig. 2 it is, aligned with thecenter line of the slot 12 one-half slot pitch from the centerline of the. tooth 16. In Fig. 1 the face of the pole 13 is presentedlto three teeth of the stationary member, and inJFig. 2, it is presented to three teeth-of the stationary member but the magnetic pull between the pole and the stationary member is diminished by thepartly closed slots 17 in which the conductor bars Hare arf ranged: This causes variation in radial mag and the stationary member 10, and as a result,

when'a machine,, is in operation, this causes; {v brat on of thestat onary member and produces a musical note. I

.ne'tic pull between the polel3 of the machine' "In accordance with my invention, there'- fore, I cutadditional'open slots 18 in thefac'je. 1 of the pole 13, which *are devoid of Wind- I ings, as shown in Figs. 3 and 40f the draws to substantially reduce any variationlinrar dial magnetic pull between the pole 13 and.

the stationary memberlOduring rotation of which are arranged insuch manneras the pole inside of the stationary member; In.

Fig. 3the faceof'the pole 13 is presented to q three teeth of the stationary member, but the: 'f

radialmagnetic pull between them is reduced] by theslots :18. When the pole is moved one halfslotpitch, as indicatedfin Fig. 4, the 'open'slots l8 are'aligned with the slots in the stationary member-so that they do not sub-- stantially'aflect the radial magnetic pulhbut it isreducedqby theslots 17 which are pre-" sented to the teeth 16 in the stationary member. It will thus be seen that the radial magnetic pull of the pole13 of the stationary member 10 is substantially constant for all positions of the poles with respect to the sta-' tionary member so that vibration of the stationary member and the objectionable noise produced thereby is substantially obviated.

In Fig. 5 the salient pole 19 of the machine shown is provided with a winding having conductor bars 20 arranged in partially closed slots 21 in the faces of the poles and conductor bars 22 at the sides of the poles. In Fig. 5 the center line of the pole 19 is in alignment with the center line of a tooth 16 of the stationary member 10, and the face of the pole is presented to slightly more than three of the teeth 16. Upon rotation of the pole 19 one-half slot pitch from the position shown in Fig. 5 the center line of the pole is in alignment with the centerline of a slot 12 of thestationary member, as shown in Fig. 6, and is presented to four of the teeth 16. In the position of the pole shown in Fig. 5, the pole is presented to a smaller number of teeth than it is in Fig. 6, and the radial magnetic pull is further reduced by the slots 21. This causes variation in radial magnetic pull between the pole 19 and the stationary member 10 which makes the machine noisy in operation. I

In accordance with my invention variation in radial magnetic pull during operation of this machine is reduced so as to make the machine quiet by plugging the slots 21 with strips 23 of magnetic material, as shown in Figs. 7 and 8, or in any other suitable manner, and cutting four open slots 24 in the face of the pole which are devoid of windings and which are arranged so as to make the radial magnetic pull between the pole and the stationary member substantially constant for all positions of one with respect to the other. In Fig. 7 the open slots 24: are aligned with the slots 12 of the stationary member, and the face of the pole is presented to slightly more than three teeth of the stationary member and in Fig. 8 theface of the pole is presented to four of the teeth of the stationary member, but the radial magnetic pull is made approximately the same as when the pole is in the position shown in Fig. 7 by the reduction of the magnetic pull caused by the aligning of the open slots 24 with the teeth 16 of the stationary member.

In Fig. 9 I have shown a machine having a salient pole 25 without slots in the face thereof. It will be noted that in the position shown the center line of the pole is in alignment with a tooth 16 of the stationary member, and that the face of the pole is presented to three of the teeth 16. Upon rotation of the pole 25 one-half slot pitch from the position shown in Fig. 9 to that shown in Fig. 10 the center line of the pole is aligned with the center line of a slot 12 of the stationary member, and the face of the pole is presented to two teeth only of the stationary member. This causes wide variation in magnetic pull between the pole 25 and the stationary member 10 whenv itis moved .from the positionshown in Fig.9;tq that shown in Fig. 10 which causes the machine to be noisy in operation.

In accordance with" my invention the r-a dial magnetic pull between the pole 25 and the stationary member 10 is made substantially constant by cutting open slots 26 in the face of the pole 25 which are devoid of windings. The slots 26 are arranged so that 30 when the face ofthe pole is presented to three of the teeth 16 of the stationary member that the slotsreduce the magnetic pull, and-so that when, the center line is alignedwith the. centerline of the slot of the stationary memher, as shown in Fig. 12, that the slots 26 of the rotatable member are aligned with slots 1 of the stationary member and do not ,subatantially affect the magnetic poll. .11! this way the magneticv pull between the pole 25 amd 'l 1stationary IfIlembfil 10 is made substane- 1a y constant or a o'sitions of wi respect to the other, and the machinM quiet inoperation- Although-I have shownmy. invention in 5 connection with several different .particular forms of salient pole dynamo. electric ma chines, I do not desire my invention to be limited to machines of this type, and I intend in the ap ended claims to cover all modi- 0.

fications whic do not depart from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. A dynamo electric machine including 0 stationary and rotatable members, windings carried by said members, one of .said, mam-1 bers havin slots. proportioned and arranged, In such re ation as to makethe radial magneticpull between the stationary and rotatable members substantially constant in. all;

os tions with respect to the stationary memer so as to'reducenoise produced bythe machine during its operation.v

2. A dynamo electric machine lincludin g 115.

slotted stationary and rotatable members, w1nd1ngs 1n said slots, said-rotatable mem bers having other slots proportioned and I arranged in such relation as tomake the radial magnetic pull between the stationary'and. rotatable members substantiall constant in all positions with respect to t e stationary member so as to reduce noise produced by the machine during its operation.

3. A dynamo electric machine including slotted stationary and rotatable members, and windings in said slots, the periphery of one of said members having open slots proe. portionedfand. arranged in suchrelation- Is to maketheradial"magneticpull between the radial magnetic pull between the stationary in the slots in said poles, the faces of said member having salient poles provided with stationary and rotatable memberssubstam tially constant in all positions with respect to the stationary member so as to reduce noise produced by the machine durmg its opera 4. ,A dynamo electric machine including an armature and salient-poles,the'faces of said poles having open slots therein-proportioned and arranged in such relation as to make the and rotatable members substantially constant in all positions with respect to the stationary memberso asto reduce noise produced by the machine during its operation.

5. A dynamo electric machineincluding a slotted stationary member and a rotatable member having salient poles provided with winding slots in the face thereof, windings in the slots of saidstationary member; and

closed winding slots adjacent the faces thereoflwindings in the slots of said sta-.

tionary member and in the slots of said poles, the faces of said poles having other open slots therein arranged in such relation as to make theradial magnetic pull between the stationary and rotatablemembers substantially constant in all positions of the rotatslotted stationary and rotatable members, and windingsin said slots, the periphery of one of said members having open slots devoid of windings'and arranged in such relationas stationary "and. rotatable members substan to makethe radial magnetic pull between the tially constant in all positions of the rotatable member with respectto thestationary member so as to reduce noise produced by I the machine during itsoperation.

10. A dynamo electric machine including j an armature and salient poles, the faces o said poles having open slots therein devoid of windings and arranged in such relation as to make the radial magnetic pull between the stationary and rotatable members substantially constant in all positions of the rotatable member with respect to the stationary member'so as to reduce noiseproduced by the machine during its operation.

-11. A dynamo electric machine including i a slotted stationary member and a rotatable in the slots of. said stationary member and in the slots in said poles, the faces of said poles member havingsalient poles provided with p winding slots in the faces thereof, windings having other open slots therein devoid of to make the radial magnetic.pullbetween-the stationary and rotatable members substan tially constant .in all positions of the 'rotat windings and arranged in such relation as on, I 5

ableimember with respect to the stationary the machine during its operation.

.In witness whereof, I have hereunto set my hand this 18th day of May, 1929.

, HAMILTON D. TAYLOR.

able member with respect to the stationary A member sov as to reduce noise produced by the a machine during its operation.

7. A dynamo electric'machine including stationary and rotatable members, windings carried by said members, one of said membershaving slots devoid of windings and arranged a in such relation as to make the radialrmagnetic'pull'between the stationary and rotatable members substantially constant in'all positions of the rotatable member with respect to the stationary member so as to reduce noise produced by the machine during its operation.

8. A dynamo electricmachine including slotted stationary and rotatable members,

windings in said slots, said rotatable members g arranged in such relation as to ma e the radial magnetic pull between'the stationary and rotatablemembers substantially constant in all positions of the rotatable member with I respect to the stationary member so asto reduce noise V producedby the machine dliring its operation. 4

having'other slots devoid of windin s and A dynamo. electric machine'including member so as to reduce noise producedby j CERTIFICATE OF CORRECTION.

} Patent No. 1,890, 344. December 6, 1932.

HAMILTON D. TAYLGR.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, lines 21 and 36, claims 5 and. 6 respectively, after "therein" insert the words "proportioned and"; and that the said Letters Patent should be read with these eerrections therein that the same may conform to the record oi the ease in the Patent Office.

Signed and sealed this 24th day of January, A. D. 1933.

(Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,890,344. I December 6, 1932.

HAMILTON D. TAYLOR.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as ieilows: Page 3, lines 21 and 36, claims 5 anti 6 respectively, a'iter "therein" insert the words "proportioned and"; and that the said Letters Patent should hereaci with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 24th day of January, A. D. 1933.

(Seal) Acting Commissioner of Patents. 

